LOS ANGELES (Reuters) - Prosecutors on Wednesday asked a judge to sentence Michael Jacksons former doctor to the maximum four years in prison for his involuntary manslaughter conviction in the singers 2009 death. In a separate court filing, defence attorneys for Dr. Conrad Murray, 58, sought to convince Los Angeles trial judge Michael Pastor to sentence their client to probation. The dueling legal papers come in advance of a hearing on Tuesday at which Pastor will issue his sentence for Murray, who is currently in jail awaiting that court date. Jackson was found lifeless at his mansion on June 25, 2009, about three weeks before he was due to begin a series of comeback concerts in London.